In electrochemistry, how would you know which cell combination is a more spontaneous reaction?
Is it the combination with the higher standard potential?
eg. Ag-Cu cell = 0.46 V , Ag-Zn cell = 1.56 V
So Ag-Zn cell would be more spontaneous?
Could someone clarify and explain this to me plz?

Question

In electrochemistry, how would you know which cell combination is a more spontaneous reaction? 
Is it the combination with the higher standard potential?
eg. Ag-Cu cell = 0.46 V , Ag-Zn cell = 1.56 V
 So  Ag-Zn cell would be more spontaneous?
Could someone clarify and explain this to me plz?

4n1m0s1ty · Answer

This link might help: http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Basics_of_Electrochemistry#At_Equilibrium

anonymous · Answer

Yeah I already checked that link on my own. I just want to know if higher voltage means a more spontaneous reaction?

4n1m0s1ty · Answer

Yes, because of the free energy equation:

$$\Delta G = -nF(EMF)$$

Increasing the EMF, should make free energy more negative and thus a more spontaneous reaction

anonymous · Answer

Thanks! :)